Hi foggydew
Sharing. Hope it helps.
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Ok, that is all standard, and I generally can ignore it or deal with it.
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Good job.
[... .] he told me that he wants to provoke, and the less I react, the more he wants to provoke. He wants me to shout at him. He says he has never seen me angry or emotional, and he wants this.
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The apparent 'need' to get a reaction parallels my experience. From what I understand, it's normal for pwBPD.
[... .] On the other hand, if he really needs this to get himself under control and stop provoking me? This is the main question worrying me at the moment ... though there are lots of others... .
Use a boundary. Effective if done properly. Saves energy.
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I read this to be your situation.
(1) He is creating poor behaviour.
(2) He wants you to reward it.
The 'reward' is: he successfully creates a negative emotional / physical response from you.
If you perform what he asks, that is perhaps a combination of three things:
(1) improper validation,
(2) enabling,
(3) rewarding the negative behaviour.
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" if he really needs this to get himself under control and stop provoking me"
They seem to theoretically 'need' it. Yet, most appropriate action is dealing with this 'need' skilfully.
'Reciprocating' undesirable behaviour is feeding a pwBPD's problems. This almost always worsens problems.
You mentioned he has "never seen [you] angry or emotional". Don't show him you can be a quenching source.
If he indeed is a pwBPD, you're perhaps best served by simply knowing the stove is hot. Don't touch it.